Wireless communication system, wireless base station apparatus, and wireless communication method

a wireless base station and wireless communication technology, applied in the field of wireless communication systems, wireless base station devices, wireless communication methods, can solve the problem of not taking into account ffr, and achieve the effect of suppressing an increase in overhead

Inactive Publication Date: 2011-04-14
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0036]According to the present invention, avoidance of interference through beam forming for which plural wireless base stations collaborate with one another, and the...

Problems solved by technology

However, in the related arts, randomizing interference through beam forming is implemented...

Method used

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  • Wireless communication system, wireless base station apparatus, and wireless communication method
  • Wireless communication system, wireless base station apparatus, and wireless communication method
  • Wireless communication system, wireless base station apparatus, and wireless communication method

Examples

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Embodiment Construction

1. Beam Forming

[0065]FIG. 5 is a diagram showing beam forming employed in an embodiment of the present invention. The axis of abscissas indicates angles and covers 360° over the entire length thereof from the left end thereof to the right end thereof. Twelve beams having a semi-fixed pattern are plotted. Curves 800 represent the beam pattern. The axis of ordinates signifies that an antenna gain for a beam gets higher in a direction from a lower part of the sheet of paper of the drawing to an upper part thereof. Each beam is formed according to, for example, a digital beam forming (DBF) technology. In the DBF, beam forming like the one shown in FIG. 5 is achieved by performing digital signal processing of applying an appropriate complex weight of a phase or amplitude to signals to be transmitted through plural antenna elements.

[0066]FIG. 26 is a diagram showing an example of a construction of a polarization-diversity array antenna.

[0067]FIG. 26 shows an example of an array of antenna...

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Abstract

Random beams and FFR are used in combination, frequencies are grouped into a zone associated with the center of a cell and a zone associated with the border of the cell, and the random beams are applied only to the zone associated with the border of the cell. Since the number of resources to be allocated to the random beams decreases, a terminal lying on the border of the cell can reduce overhead. Using the zone associated with the center of the cell, beam scheduling can be freely performed within the cell.

Description

CLAIM OF PRIORITY[0001]The present application claims priority from Japanese patent application JP 2009-236516 filed on Oct. 13, 2009, the content of which is hereby incorporated by reference into this application.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a wireless communication system, a wireless base station device, and a wireless communication method. In particular, the present invention is concerned with a wireless communication system of a cellular type or the like having a mechanism of alleviating an effect of interference even in a border area between base stations in a case where the quality of a signal may be degraded due to interference of signals, transmitted from the plural base stations, with each other.[0004]2. Description of the Related Art1. Cellular Communication[0005]In mobile wireless communication, since a moving terminal and a base station communicates with each other within a service area that spreads as a...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04L12/26
CPCH04W72/046H04W16/10
Inventor KUWAHARA, MIKIO
Owner HITACHI LTD
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